The Gallery Plugin for WordPress WordPress plugin before 1.8.15 does not sanitise and escape some of its image settings, which could allow users with post-writing privilege such as Author to perform Cross-Site Scripting attacks.
The Gallery Plugin for WordPress – Envira Photo Gallery plugin for WordPress is vulnerable to unauthorized modification of data due to an improper capability check on the 'envira_gallery_insert_images' function in all versions up to, and including, 1.8.7.1. This makes it possible for authenticated attackers, with contributor access and above, to modify galleries on other users' posts.
The Gallery Plugin for WordPress plugin before 1.8.4.7 does not escape the $_SERVER['REQUEST_URI'] parameter before outputting it back in an attribute, which could lead to Reflected Cross-Site Scripting in old web browsers